The closure of the Holden plant at Elizabeth will put the brakes on South Australia's economy but will not stop growth completely, an economic survey has found.

The quarterly Deloitte Access Economics Business Outlook found while the loss of Holden from 2017 will hit manufacturing industry hard in the next few years, car and components makers account for less than 1.5 per cent of the local economy.

The SA Government will fast-track almost $35 million worth of capital spending to stimulate the economy in the wake of Holden's decision to close, but the Opposition says the measures will not help workers at the Elizabeth plant.